Table 3.

Results for heterogeneous phantom. The first three columns list the known values and position of μ_a for the phantom background and three heterogeneities (numbered 1, 2, 3, clockwise starting from upper right corner) according to Fig. 3. Column four lists the mean and standard deviation of the measured μ_a for the background and the three heterogeneities. The last column specifies the percentage difference between the measured and the true μ_a value.

Description	Region specification	True μa values	Uniform Fit			In-air scan fit
			Measured μa values	% diff	Max % diff	Measured μa values	% diff	Max % diff
Background	D2, S3 (Fig. 8d)	0.2	0.212±0.026	6%	26%	0.212±0.026	6%	26%
Heterogeneity 1	D3, S4 (Fig. 8f)	0.5	0.381±0.024	24%	33%	0.390±0.022	22%	30%
Heterogeneity 2	D5, S11 (Fig. 8h)	0.1	0.130±0.030	30%	69%	0.127±0.029	27%	57%
Heterogeneity 3	D1, S1 (Fig. 8b)	0.9	0.654±0.085	27%	37%	0.731±0.146	19%	37%